An advance on Richmond, Virginia and Mobile, Alabama. Upon taking command of all of the Union armies, Grant ordered a grand coordinated assault on the remaining Confederate strongholds. In doing so, he forced the southern armies in each theater to fight their own desperate battles, thus denying the Confederacy's strength of interior lines that allowed the quick redeployment of reinforcements to threatened theaters.

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Answer:

An advance on Richmond, Virginia and Mobile, Alabama. Upon taking command of all of the Union armies, Grant ordered a grand coordinated assault on the remaining Confederate strongholds. In doing so, he forced the southern armies in each theater to fight their own desperate battles, thus denying the Confederacy's strength of interior lines that allowed the quick redeployment of reinforcements to threatened theaters.